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@chlan0321 I tried multiple times to start it, restarted computer. And after some time I didn't had any more patience and opened Opera stable browser. And I noticed after some time that Opera Developer opened... I don't know what happened and why Opera started working after so much time.
After update Opera developer is not working I only get splash screen. I tried to restart computer and to do manual update and it's the same... It's not starting...
Update... after all that I wrote... and few more tries to start, Opera browser started to work.
@gmiazga Sync is enabled for me so it could be source of problem...